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Martin David James Reginald: Radiating line transmission system. Coal, Wray James C, July 22, 1975: US3896380 (135 worldwide citation)

A radiating transmission line system employs a pair of leaky coaxial cables which are spaced from each other and extend along a tunnel to propagate radio signals. The signals to be propagated are fed to both cables in such a manner that the signals in one cable are in antiphase to the signals in the ...


2
Martin David James Reginald, Davis Quintin Visser: Radio frequency communication systems. Coal, Wray James C, October 28, 1975: US3916311 (25 worldwide citation)

A radio communication system suitable for use in tunnels and mines uses a leaky radiating transmission line connected between a transmitter and a receiver to transmit radio frequency signals to a local receiver. Unidirectional repeaters are located in the transmission line and a return path is provi ...


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Martin David James Reginald: Radio frequency communication systems. Coal Industry Patents, September 29, 1971: GB1248223-A (3 worldwide citation)

1,248,223. Radio signalling. COAL INDUSTRY (PATENTS) Ltd. 16 May, 1969 [20 Feb., 1968 (3)], Nos. 8224/68, 8225/68 and 8226/68. Heading H4L. The system disclosed in Specification 1,248,222 is modified in that the speech signals are transmitted along the line by amplitude modulation in both directions ...


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Martin David James Reginald: Radio frequency communication systems. Coal Industry Patents, September 29, 1971: GB1248222-A (3 worldwide citation)

1,248,222. Radio signalling. COAL INDUSTRY (PATENTS) Ltd. 9 May, 1969, Nos. 6985/68 and 6986/68. Heading H4L. The system disclosed in Specification 1,239,231 is modified in that speech signals from the base station to the mobile station are transmitted along the line as frequency-modulated signals a ...


6
Martin David James Reginald: Direction-adaptive repeaters for guided radio systems. Martin David James Reginald, December 10, 1986: GB2176079-A (1 worldwide citation)

A repeater for use in a two-way guided radio system such as a leaky-feeder system is basically a simple one-way device but adapts itself automatically to suit the direction of propagation of a signal appearing at either of its terminals 1 and 2 and remains in that steady directional mode for the dur ...


7
Martin David James Reginald: Electrical systems. Coal Industry Patents, April 7, 1965: GB988531-A (1 worldwide citation)

988, 531. Measuring pressure electrically. COAL INDUSTRY (PATENTS) Ltd. July 28, 1961 [July 28, 1960], No. 26266/60. Heading G1N. [Also in Division G4] In an electrical system for connecting a control panel to one of a number of mine hydraulic roof chocks the wires which carry selecting signals are ...


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Martin David James Reginald: Electrical systems. Coal Industry Patents, January 24, 1968: GB1100722-A

1,100,722. Selective signalling. COAL INDUSTRY PATENTS Ltd. 11 June, 1965 [16 June, 1964], No. 24952/64. Heading G4H. A mine roof support unit is selected from a group of twenty units by selectively applying A.C. to one and D.C. to another of five selection wires, only one transistor gate unit being ...


9
Martin David James Reginald: Electrical systems. Coal Industry Patents, March 16, 1966: GB1022414-A

1,022,414. Advancing mine roof supports. COAL INDUSTRY (PATENTS) Ltd. Jan. 1, 1963 [Jan. 4, 1962], No. 432/62. Heading F1P. In an electrical system, Figs. 1 and 2 (not shown), for an hydraulic mine roof support system wherein electrical signals can be received from and/or transmitted to a plurality ...


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Martin David James Reginald: Improvements in or relating to indicating systems. Coal Industry Patents, June 2, 1966: GB1031612-A

1,031,612. Selective signalling. COAL INDUSTRY (PATENT) Ltd. Feb. 19, 1965 [Nov. 22, 1963], No. 46207/63. Heading G4H. In a system for indicating at a remote point which one of a plurality of switches has been actuated the switches 1A, 2A . . ., Fig. 1, are arranged in series so that normally a batt ...